1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77051ec3b16c7b7459fc2b2df378b030f25a17b6079cfa5888d192ed1419bfef. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/831c7ba4-fdae-4ea7-8e3c-7ae831fe173f.json and https://artists.proofprofile.net/proofs/artist/831c7ba4-fdae-4ea7-8e3c-7ae831fe173f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532c6f57e8a94afc857b630adc35eb72b07fbaa99ddc06528b3d0ecad99fd66d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6Q2081986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c6654ec9ea81f4213879efbd5dd11f2d28972121addede852dc243c7076345. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA82246897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e56fe5e1a65d591dcc62d3317cf71897a9252020540326553bd9f96fd628e9. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA82246899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73c0ae223f41fce0198cda6dcef74a7a525c5a6cc86e20a1fe9dbb2a5ae5367. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62232350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f4ffd6ffa270c35c493661a230a91e07e8162d9c2011d16493d5cd69f7a2ba. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62232355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e484b2f3f9835265587b63509c88773abdc6a3f61f2a8880862e5aa5d4f91a7. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA62407431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef3695ec190e7c11adb10ab740ea941385aa04af3a6289519a696de5166aa6c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA62407432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cbdcb5908b800032465365ffd82108ffd0d89ceba5646c5ce27d1c62be29249. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA62407433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20151260f5506bfda208d5ce8438c3cb8b7f9899f6b0b54889c0d8145fb6b70f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA62407434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde529f98ea0995e8bbdb8d4829d8644bdd47925085b2681dda1aee9e6838e97. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA62407436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf496bf64cb7b26ebaa8d87e7ca48964f30308aef2435b460d529c717ec23c0c6. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EY2460630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd4921b8324e0fd156417ee0072ecfa16af5d720a40d07eb8e41f32caeab664. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EY2460631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8865e13eaec7c8f4f28c8859f81580d30528ce81c2a2386a16d6d23451850c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EY2460633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c148012f4a4357ef911a14c34cf9901b27f8b80c3bdf8d1b5561aedb39cd886. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6J2565328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071ddaefe12ea0ff5574d521e7aaefda6f05503d1408b42f79470b00c2a67f05. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6J2565329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f71d05319320f7dccc7b06c8f3ac8568c5604c67ab7ce7175574c62e09c5ee. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAT2523902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83f3e64c38b8ddf7d1e51a407a551a577ef52574e76482789811e3dc1ae7dc5. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZACR2400619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4385934a9ba65d5e98174b3eb84654fc3dd3ef05e093533ee7da6c03da7655f5. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA62437979.